package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.vo.OrderReportVO;
import com.sky.vo.SalesTop10ReportVO;
import com.sky.vo.TurnoverReportVO;
import com.sky.vo.UserReportVO;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
public class ReportServiceImpl implements ReportService {
    
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    
    /**
     * 营业额统计
     * @param begin
     * @param end
     * @return
     */
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        //存放从begin到end的日期
        List<LocalDate> dataList = new ArrayList<>();
        dataList.add(begin);
        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dataList.add(begin);
        }
        
        //存放从begin到end的营业额
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate localDate : dataList) {
            //获取日期对应的营业额,营业额是指某个日期下订单状态为已完成的订单金额之和
            LocalDateTime beginTime = LocalDateTime.of(localDate, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(localDate, LocalTime.MAX);
            Map map = new HashMap<>();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover= orderMapper.sumByMap(map);
            turnoverList.add(turnover == null ? 0.0 : turnover);
        }
        
        return TurnoverReportVO.builder()
                .dateList(StringUtils.join(dataList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();
    }
    
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //存放从begin到end的日期
        List<LocalDate> dataList = new ArrayList<>();
        dataList.add(begin);
        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dataList.add(begin);
        }
        
        //存放从begin到end的新增用户数
        List<Integer> newUserList = new ArrayList<>();
        //存放从begin到end的总用户数
        List<Integer> totalUserList = new ArrayList<>();
        
        for (LocalDate localDate : dataList) {
            LocalDateTime beginTime = LocalDateTime.of(localDate, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(localDate, LocalTime.MAX);
            Map map = new HashMap<>();
            map.put("end", endTime);
            totalUserList.add(userMapper.countByMap(map));
            map.put("begin", beginTime);
            newUserList.add(userMapper.countByMap(map));
        }
        return UserReportVO.builder()
                .dateList(StringUtils.join(dataList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .build();
    }
    
    /**
     * 订单统计
     * @param begin
     * @param end
     * @return
     */
    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        //存放从begin到end的日期
        List<LocalDate> dataList = new ArrayList<>();
        dataList.add(begin);
        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dataList.add(begin);
        }
        
        //存放从begin到end的订单总数
        List<Integer> orderCountList = new ArrayList<>();
        //存放从begin到end的订单完成数
        List<Integer> validOrderCountList = new ArrayList<>();
        
        //遍历集合，获取每天的订单总数和订单完成数
        for (LocalDate localDate : dataList) {
            //查每天的订单总数
            LocalDateTime beginTime = LocalDateTime.of(localDate, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(localDate, LocalTime.MAX);
            Integer totalOrderCount = countOrder(beginTime, endTime, null);
            //查每天有效订单数
            Integer validOrderCount = countOrder(beginTime, endTime, Orders.COMPLETED);
            
            orderCountList.add(totalOrderCount);
            validOrderCountList.add(validOrderCount);
        }
        
        //计算时间区间内的订单总数
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        //计算时间区间内的有效订单数
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();
        //计算订单完成率
        Double orderCompletionRate = 0.0;
        if (totalOrderCount != 0) {
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }
        
        return OrderReportVO.builder()
                .dateList(StringUtils.join(dataList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }
    
    /**
     * 销量排名top10
     * @param begin
     * @param end
     * @return
     */
    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);
        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        return SalesTop10ReportVO.builder()
                .nameList(StringUtils.join(names, ","))
                .numberList(StringUtils.join(numbers, ","))
                .build();
    }
    
    //根据条件统计订单数量
    private Integer countOrder(LocalDateTime begin, LocalDateTime end, Integer status) {
        Map map = new HashMap<>();
        map.put("begin", begin);
        map.put("end", end);
        map.put("status", status);
        return orderMapper.countByMap(map);
    }
}
